I think USP is alright... But, the big thing about Jack3d that most ppl feel/like is the d1,3, which can be bought in bulk for dirt cheap, and dosed/added to any pre-workout you like...

For the money, my favorite is Controlled Labs Green Magnitude/White Flood or MP Assault... Plus, it's very possible that Jack3d's big ingredient (the d1,3) may be banned in the not so long future... Already banned in Australia and a few other countries because ppl are using it as a party drug, lol.